Insulator



12, 1 943. KRUEGER 2,331,481

' msuum'on Filed Oct. 13, 1942 INVENTOR.

Herr l an S. Krueger BY Hwy}. at.

Patented Oct. 12, 1943 UNITED" STATES PATEN T OFFICE 2 Claims.

This invention relates to improvements in insulators, and it hasparticular relationship to insulators which are now in use on mono railhoists, and the objects of my improvement are as follows:

First, to provide an insulator particularly well adapted for use whereit it exposed to moisture due to climatic and building conditions.

Second, to provide an insulating structure through which a bolt or rodiron extends to support the insulating structure from below or fromabove and which includes conductor clamping means of non-conductingmaterial.

Third, to provide an insulator consisting of three or more parts, two ofwhich are of equal design so that they can be interchanged.

Fourth, to provide a simple device for the purpose stated above, whichis light in weight and simple in construction to be manufactured andsold at a very reasonable price.

Further objects of the instant invention reside in any novel feature ofconstruction or operation or novel combination of parts present in theembodiment of the invention described and shown in the accompanyingdrawing.

In the drawing:

Fig. 1 is a front elevation of the insulator; Fig. 2, a side elevationof the insulator; Fig. 3, a bottom plan view of the insulator; Fig. 4, afront elevation of a modification of a part of the insulator; and Fig.5, a plan view of this modification.

Similar numerals refer to throughout the several views.

In Figs. 1 to 3 the numeral I designates a T-shaped top plate ofporcelain or other suitable dielectric material having an aperture 2 inits center and grooves 3 for a break in moisture on its face 4, on thebottom 5 of its broader part, on its front side 6, and on its rear sideI. A bottom plate 8 is of exactly the same design and material and isalso provided with the same grooves 3 as the top plate I; so that if atop or bottom plate breaks, it can be replaced by a duplicate of eithera top or a bottom plate.

similar parts Between the top plate I and the bottom plate.

8 are U-shaped plates 9 and II! of porcelain or other suitabledielectric material. Each of these plates 9 and III has an aperture IIin its center and two ledges I2 adjacent the inner side of each flangeI4. The ledges I2 are adapted to support the contact rails I5. Theplates 9 and IQ are also provided with grooves .3 adjacent the ledges I2as well as at the front and rear sides. One of the U-shaped plates isprovided with spacing posts IE to keep the plate 9 spaced at a distancefrom the plate I0 so that air can pass through between the plates 9 andI0. In the present instance, plate III is provided with four spacingposts I 6.

According to the modification of the invention shown in Figs. 4 and 5,one double-T-shaped plate H can be used instead of the two U-shapedplates 9 and I0. The top and bottom sides I8 and IQ of plate I! are ofthe same design as the top side 29 of plate 9, and the plate IT is alsoprovided with an aperture I I, with ledges I2, and with grooves 3.

The apertures 2 and II can be made as round holes large enough to allowa threaded hanger bolt 2| to pass through. However, I prefer to providethe apertures with drain slots 22 to drain any water which might form onor in the insulator.

In order to prevent the plates from being pressed toward each other toostrongly when tightening the nut 23, what might result in a cracking ofthe plates, a spring or an elastic washer 24 is placed between the nut23 and the plate I. This elastic washer may be of any approved design,preferably consisting of a piece of sheet steel, the ends 25 of whichare bent inwardly as shown in Fig. 1. The washer 24 is provided with anaperture in its center for the passing through of the bolt 2I.

While there has been shown and described and pointed out the fundamentalnovel features of the invention as applied to only two modifications, itwill be understood that various omissions and substitutions and changesin the form and details of the device illustrated may be made by thoseskilled in the art without departing from the spirit of the invention.It is the intention, therefore, to be limited only as indicated by thescope of the following claims.

What is claimed is:

1. An insulator comprising a T-shapecl top plate of insulating materialhaving an aperture in its center and grooves for a break in moisture onthe face, on the bottom, on the frontside and on the rear side of itsbroader part; a bottom plate of insulating material being of exactly thesame design as said top plate; two U-shaped intermediate plates ofinsulating material between said top and bottom plates, each of saidU-shaped plates having two ledges adjacent the inner side of each flangeto support contact rails clamped between said top, bottom andintermediate plates, grooves for a break in moisture adjacent saidledges and at the front and rear sides, and an aperture in its centerplaced at a distance from said ledges; spacing posts between saidU-shaped plates; a threaded bolt extending through said apertures andadapted to support the insulator; a nut on said bolt; and an elasticWasher between said nut and the insulator, substantially as described.

2. An insulator comprising T-shaped top and bottom plates of insulatingmaterial, each having an aperture in its center and grooves for a breakin moisture on the face, on the bottom on the front side and on the rearside of its broader part; a double-T-shaped insulating plate betweensaid top and bottom plates, said double-T-shaped plate having fourledges adjacent the inner side of each flange to support contact railsclamped between said top, bottom and intermediate plates, grooves for abreak in moisture adjacent said ledges and at the front and rear sides,and an aperture in its center placed at a distance from said ledges; athreaded bolt extending through said apertures and adapted tosupport'the insulator; a nut on said bolt; and an elastic washer betweensaid nut and the insulator, substantially as described.

HERMAN KRUEGER.

